YouTuber ferlessleedr is a LEGO store employee and a Portal fan, so he decided to merge his passions to create this incredible 2000-piece replica Portal gun, which he's brought to this week's CONvergence in Minneapolis. With changing orange and blue lights and LEGO Mindstorm-powered prongs, this may be the coolest …

This clock, made by Greg Blonder from a Lego Mindstorms set, is an homage to the slide rule. It's super simple to read; the upper rule tells the hours and the lower tells the minutes. They move independently, and the stationary window shows the time. This update to a retro gadget is kind of hypnotizing to watch, even…